• Proceedings of the Korea Information Processing Society Conference
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• 2012.04a
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• pp.469-472
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• 2012

최근 IT 분야의 화두로 '빅 데이터'가 떠오르고 있으며 많은 기업들이 이를 분석하여 이익을 증대하기 위한 노력을 하고 있다. 이에 구글은 초기에 맴리듀스라고 하는 대용량 분산처리 프레임워크 기술을 확보하여 이를 기반으로 한 서비스를 제공하고 있다. 그러나 스마트 단말 및 소설미디어 등의 출현으로 다양한 디지털 정보들이 그래프로 표현되는 추세가 강화되고 있으며 기존의 맵리듀스로 이를 처리하는 데에 한계를 느낀 구글은 Pregel 이라는 그래프 형 자료구조에 최적화된 또 다른 분산 프레임워크를 개발하였다. 본 논문에서는 일반적인 그래프 형 데이터가 갖는 특성을 분석하고, 대용량 그래프 데이터를 처리하는데 있어 맵리듀스가 갖는 한계와 Pregel은 어떤 방식으로 이를 극복하고 있는지를 소개한다. 또한 실험을 통하여 데이터의 특성에 따른 적절한 프레임워크의 선택이 대용량 데이터를 처리하는 데에 있어서 얼마나 큰 영향을 미치는지 확인한다.

• 한국정보디스플레이학회:학술대회논문집
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• 2004.08a
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• pp.1262-1265
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• 2004

To increase the performance of the light diffusion films, we controlled the three dimensional microstructure of the organic fillers(beads). The refractive index, the size distribution and the three dimensional distribution of beads play an important role to determine the performance of light diffusion films for the backlight unit of TFT-LCD.

• Korea Information Processing Society Review
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• v.18 no.5
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• pp.65-74
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• 2011

• Journal of the Korean Chemical Society
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• v.42 no.5
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• pp.570-574
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• 1998

• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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• 2002.10b
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• pp.445-446
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• 2002

The purpose of this study was to investigate the effect of micro holes, pattern structure and elastic modulus of pads on the polishing behavior such as the removal rate and WIWNU (within wafer non-uniformity) during CMP. The regular holes on the pad act as the superior abrasive particle's reservoir and regular distributor at the bulk pad, respectively. The superior CMP performance was observed at the laser processed bulk pad with holes. Also, th ε groove pattern shape was very important for the effective polishing. Wave grooved pad showed higher removal rates than K-grooved pad. The removal rate was linearly increased as the top pad's elastic modulus increased.

• 한국정보디스플레이학회:학술대회논문집
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• 2005.07b
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• pp.1143-1146
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• 2005

Novel series of electron-transporting hosts, pentavalent aluminum complexes containing 8 hydroxyquinoline ligands and various phenolato ligands were synthesized, and organic light-emitting diodes (OLEDs) were fabricated using these complexes as host materials of phosphorescent emitting device and the fabricated phosphorescent emitting device showed low driving voltage, high efficiency at high current density and good stability under conventional driving condition.

• KSTLE International Journal
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• v.5 no.1
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• pp.32-35
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• 2004

The purpose of this study is to investigate the effects of the structure and mechanical properties of laser-processed pads on their polishing behavior such as their removal rate and WIWNU (within wafer non-uniformity) during the chemical mechanical planarization (CMP) process. The holes on the pad acted as the reservoir of slurry particles and enhanced the removal rate. Without grooves, no effective removal of wafers was possible. When the length of the circular-type grooves was increased, higher removal rates and lower wafer non-uniformity were measured. The removal rate and non-uniformity linearly increased as the elastic modulus of the top pad increased. Higher removal rates and lower non-uniformity were measured as the hardness of the pad increased.

• Polymer Science and Technology
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• v.6 no.6
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• pp.585-594
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• 1995

• Polymer Science and Technology
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• v.3 no.3
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• pp.185-206
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• 1992

• Journal of Korean Society of Occupational and Environmental Hygiene
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• v.24 no.2
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• pp.193-200
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• 2014

Objectives: To develop domestic charcoal tubes with good adsorption capacity, breakthrough experiments were performed on four types of activated charcoal. Materials: The adsorption capacity and the adsorption rate were determined using a modified Wheeler equation after the breakthrough experiment. For four types of charcoal (J, K, S and SKC Inc. 226-01), 100 mg were used in the breakthrough experiment. The test was done on benzene, toluene, n-hexane, and acetone in a dynamic chamber. Results: K charcoal had the greatest surface area and the highest micropore volume. J charcoal had a similar surface area and micropore volume to SKC charcoal. S charcoal had the lowest surface area and micropore volume. J charcoal had the highest adsorption capacity at 101, 252 and 609 ppm of benzene. The gap in benzene adsorption capacity among the types of charcoal was the least at 609 ppm and the greatest at 101 ppm. J charcoal showed the highest adsorption capacity at 54, 106, 228 and 508 ppm of toluene. J charcoal and SKC charcoal had a similar adsorption capacity for acetone. J charcoal had the highest adsorption capacity for n-hexane. In the experiment featuring 10% breakthrough volume, 10% breakthrough occurred at 18 liters at $2065.9mg/m^3$ for J charcoal and at 20 liters at $1771.2mg/m^3$ for K charcoal. It was difficult to judge adsorption capacity by surface area and micropore volume of charcoal. J charcoal, which was similar to SKC charcoal in surface area and micropore volume, showed good adsorption capacity at common workplace concentrations. Conclusions: The adsorption capacity of J and K charcoal was superior compared with SKC charcoal. J and K charcoal can be considered appropriate for use as sampling media based on this result.